Communication method, apparatus, and system

Abstract

Embodiments of this application provide a communication method, apparatus, and system. The method includes: A first terminal apparatus determines coordination information, where the coordination information is used to assist a second terminal apparatus in determining a sidelink sending resource; and the first terminal apparatus sends the coordination information to the second terminal apparatus, where a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain.

What is claimed is: 
     
         1 . A communication method performed by a first terminal apparatus or a component in the first terminal apparatus, wherein the method comprises:
 determining coordination information, wherein the coordination information is used to assist a second terminal apparatus in determining a sidelink sending resource; and   sending the coordination information to the second terminal apparatus, wherein a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain.   
     
     
         2 . The method according to  claim 1 , wherein a slot in which the second time-frequency resource is located is a slot that is after a first slot and in which a first physical sidelink feedback resource is located at a gap greater than K 1  slots from a last symbol in the first slot, and the first slot is for a physical sidelink channel of second terminal apparatus. 
     
     
         3 . The method according to  claim 1 , wherein the coordination information further comprises second information, the second information indicates that the first reserved resource of the second terminal apparatus collides with a reserved resource of another terminal apparatus, the first reserved resource is a reserved resource closest to the first slot, and the first slot is for a physical sidelink channel of second terminal apparatus. 
     
     
         4 . The method according to  claim 3 , wherein the first reserved resource is used for retransmission of a first transport block TB on the physical sidelink channel of the second terminal apparatus; and/or
 the first reserved resource is used for new transmission of a service to which a second TB belongs on the physical sidelink channel of the second terminal apparatus in a next period.   
     
     
         5 . The method according to  claim 3 , wherein the first reserved resource is indicated by a time resource indicator value TRIV on the physical sidelink channel of the second terminal apparatus; or
 the first reserved resource is indicated by a resource reservation period on the physical sidelink channel of the second terminal apparatus.   
     
     
         6 . A communication method performed by a second terminal apparatus or a component in the second terminal apparatus, wherein the method comprises:
 receiving coordination information from a first terminal apparatus, wherein a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain; and   determining a sidelink sending resource based on the coordination information.   
     
     
         7 . The method according to  claim 6 , wherein the method further comprises:
 sends a physical sidelink channel in the first slot, wherein a slot in which the second time-frequency resource is located is a slot that is after the first slot and in which a first physical sidelink feedback resource is located at a gap greater than K 1  slots from a last symbol in the first slot; or   a slot in which the second time-frequency resource is located is a slot that is before a second slot and in which a first physical sidelink feedback resource is located at a gap greater than K 2  slots from a first symbol in the second slot, the second slot is a slot in which a first reserved resource of the second terminal apparatus is located, the first reserved resource is a reserved resource closest to the first slot, and K 1  or K 2  is a minimum time gap configured by a higher layer for sending the coordination information.   
     
     
         8 . The method according to  claim 7 , wherein the coordination information further comprises second information, the second information indicates that the first reserved resource of the second terminal apparatus collides with a reserved resource of another terminal apparatus, the first reserved resource is a reserved resource closest to the first slot, and the first slot is for sending the physical sidelink channel. 
     
     
         9 . The method according to  claim 8 , wherein the first reserved resource is used for retransmission of a first transport block TB on the physical sidelink channel of the second terminal apparatus; and/or
 the first reserved resource is used for new transmission of a service to which a second TB belongs on the physical sidelink channel of the second terminal apparatus in a next period.   
     
     
         10 . The method according to  claim 8 , wherein the first reserved resource is indicated by a time resource indicator value TRIV on the physical sidelink channel of the second terminal apparatus; or
 the first reserved resource is indicated by a resource reservation period on the physical sidelink channel of the second terminal apparatus.   
     
     
         11 . An apparatus comprising: one or more processors configured to determine coordination information, wherein the coordination information is used to assist a second terminal apparatus in determining a sidelink sending resource; and
 sending the coordination information to the second terminal apparatus, wherein a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain.   
     
     
         12 . The apparatus according to  claim 11 , wherein a slot in which the second time-frequency resource is located is a slot that is after a first slot and in which a first physical sidelink feedback resource is located at a gap greater than K 1  slots from a last symbol in the first slot, and the first slot is for a physical sidelink channel of second terminal apparatus; or
 a slot in which the second time-frequency resource is located is a slot that is before a second slot and in which a first physical sidelink feedback resource is located at a gap greater than K 2  slots from a first symbol in the second slot, the second slot is a slot in which a first reserved resource of the second terminal apparatus is located, the first reserved resource is a reserved resource closest to the first slot, and K 1  or K 2  is a minimum time gap configured by a higher layer for sending the coordination information.   
     
     
         13 . The apparatus according to  claim 11 , wherein the coordination information further comprises second information, the second information indicates that the first reserved resource of the second terminal apparatus collides with a reserved resource of another terminal apparatus, the first reserved resource is a reserved resource closest to the first slot, and the first slot is for a physical sidelink channel of second terminal apparatus. 
     
     
         14 . The apparatus according to  claim 13 , wherein the first reserved resource is used for retransmission of a first transport block TB on the physical sidelink channel of the second terminal apparatus; and/or
 the first reserved resource is used for new transmission of a service to which a second TB belongs on the physical sidelink channel of the second terminal apparatus in a next period.   
     
     
         15 . The apparatus according to  claim 13 , wherein the first reserved resource is indicated by a time resource indicator value TRIV on the physical sidelink channel of the second terminal apparatus; or
 the first reserved resource is indicated by a resource reservation period on the physical sidelink channel of the second terminal apparatus.   
     
     
         16 . An apparatus comprising: one or more processors configured to receive coordination information from a first terminal apparatus, wherein a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain; and
 determine a sidelink sending resource based on the coordination information.   
     
     
         17 . The apparatus according to  claim 16 , wherein the one or more processors further configured to send a physical sidelink channel in the first slot, wherein a slot in which the second time-frequency resource is located is a slot that is after the first slot and in which a first physical sidelink feedback resource is located at a gap greater than K 1  slots from a last symbol in the first slot. 
     
     
         18 . The apparatus according to  claim 17 , wherein the coordination information further comprises second information, the second information indicates that the first reserved resource of a second terminal apparatus collides with a reserved resource of another terminal apparatus, the first reserved resource is a reserved resource closest to the first slot. 
     
     
         19 . The apparatus according to  claim 18 , wherein the first reserved resource is used for retransmission of a first transport block TB on the physical sidelink channel of the second terminal apparatus; and/or
 the first reserved resource is used for new transmission of a service to which a second TB belongs on the physical sidelink channel of the second terminal apparatus in a next period.   
     
     
         20 . The apparatus according to  claim 18 , wherein the first reserved resource is indicated by a time resource indicator value TRIV on the physical sidelink channel of the second terminal apparatus; or
 the first reserved resource is indicated by a resource reservation period on the physical sidelink channel of the second terminal apparatus.